Mercure Opera Louvre Hotel in Paris

My reservation at Mercure Opera Louvre was made under the impression it was a hotel, but it appears to be an Airbnb like facility.

I have several concerns about my stay at the Hotel, which is advertised as a 4-star establishment with Airbnb/apartment like facilities:
- I saw many hairs on the bedsheet. As you mentioned that you change bedsheet not before 3 days so these must be previous guest hairs.
- The mattress was so uncomfortable that I could feel the spring. I had sleepless nights.

* The room size is unusually small, even for Paris, suggesting it's more aligned with a 2-star hotel.
* The service is more akin to an apartment than a hotel. For example, I was asked to replace used coffee mug by new coffee mugs from the lobby. If guests are expected to perform such tasks, an apartment would be more cost-effective.
Reception area had only 2 chairs. Other than your room nothing is there.
Breakfast was so limited and left over croissants they put next day.
I ll not recommend anyone to stay there.
One more thing you better book from trip sites not from Accor sites so at-least trip like MMT and all they ll help you in these kinda situation.
If you book with Accor thn its like to whom to complaint.

I’m afraid I have to say this hotel felt more like a 3-star property—not the 4-star experience it claims to offer.

To be fair, most of the staff were friendly and helpful. They helped me book a taxi, which I appreciated.

However, the cups in our room were never replaced or washed during our four-day stay. When I asked the front desk about it, I was told there was no housekeeping service and that we needed to bring the cups down ourselves. When we did, a staff member—clearly in a bad mood—led us to the breakfast room and said, “Take two. They still seem clean though, madame.”
But honestly, who uses the same cups for four days without washing them?

To make matters worse, one of our room key cards—which we had left in the room—was taken without any explanation. We were left confused and even worried that it might have been stolen. At the very least, a note or some kind of communication should have been provided.

Given these experiences, I cannot say this hotel lives up to a four-star standard.

It was a truly disappointing stay! The photos we saw on the hotel website do not reflect the facilities and state of the hotel. It is more like a 2 star hotel. The bathroom had mould and the wall near the toilet bowl was dirty. The overall state of the room was very poor. The service of the front desk staff (yes not just one but ALL our interactions) was appalling. Every time we approached the staff to ask a question (directions or a query) it was like we were disturbing them, one staff member even rolled his eyes when we asked for directions to a restaurant.
I would not be recommending this hotel to anyone, it is more an Ibis Style than a Mercure.